[Ffmpeg-devel-irc] ffmpeg.log.20140307

[burek]

[10:58] <aterra> Hi I'm trying to stream a v4l2 device using ffserver, but I'm having a error in the codec configuration (libx264) which I can't figure out, when I use ffmpeg from the command line to encode into a file there is no issues, however when using ffserver I get "error while opening encoder for output stream #0:0", I have pasted a minimum working example of the stream part of the ffserver configuration file as well as the ffmpeg command on http://pastebin.com/tHW
[10:58] <aterra> gBZZs
[10:58] <aterra> http://pastebin.com/tHWgBZZs
[10:58] <steinchen> hi all.. may someone provide me a cmdline to convert hd 1080p into 576i? when i try any setting we have distortion in pans
[11:04] <steinchen> interlaced must be TFF in mpeg2 9mbit HQ
[11:10] <sine9> How does one use mixed frame rate clips correctly? my resulting framerate will be 25 and I shoot with 25, but when bringing in clips that are 29 and 23 etc, whats the best way to handle this. I am using Ae but ffmpeg is in my toolbox, just havent needed to use it yet
[11:50] <wix> Hello, I'm currently using ffmpeg to transcode and send a video stream to youtube (rtmp/flv/x264). I would like to know if there is a way to tell ffmpeg to exit when it's not sending data anymore (displayed size is not growing anymore). Thanks for your help !
[11:55] <relaxed> wix: write a script that checks the size from time to time, which then run $(killall -INT ffmpeg) when the size no longer increases.
[11:56] <relaxed> sine9: ffmpeg will drop or duplicate frames to achieve the desired frame rate.
[11:56] <wix> ok thanks relaxed, so there is no other way
[11:57] <relaxed> you can set -t $time.in.seconds if you know the output duration before hand
[12:13] <sine9> relaxed ok so i can take a clip that is 5 seconds at 29 fps and set the time for the same but with 25 fps and it will do the rest
[12:15] <relaxed> sine9: yes, you may want to do it lossless: ffmpeg -i 29fps.input.mkv -r 25 -c:a flac -c:v libx264 -crf 0 output.mkv
[12:17] <relaxed> lossless except for the dupped/dropped frames, that is ;)
[12:51] <sine9> thanks
[12:53] <sine9> so flac for the audio lossless
[12:53] <sine9> but x264 with 0 compression ?
[12:55] <sacarasc> x264 with crf 0 is lossless. Unless you have to change pixel format.
[12:55] <sacarasc> Or change resolution, etc.
[12:56] <sine9> cool thanks
[15:05] <flufx> Cannot compile vf_noise.c from git here: clang says "error: index register is 32-bit, but base register is 64-bit"
[15:46] <flufx> Thank you!
[15:48] <sacarasc> Sorry, that was for me for a different channel. :D
[15:49] <flufx> lol, that was exacly what I was looking for!
[15:49] <sacarasc> Heh.
[17:20] <Guiri> I noticed that x264 can use opencl if --opencl is passed as a runtime argument.  Is this argument automatically passed or would I have to use --x264-params '--opencl'?
[17:21] <Guiri> With regard to the libx264 encoder, that is
[18:24] <Wzee> Hello! I hope someone might shed some light on this... I'm attempting to run ffmpeg to do HLS input at 29.97 frames, with image2 output, the issue being that multiple duplicate images are created on connection, anywhere from one dup, to ~80 frames. Could this be because it's connecting mid stream with no iframe?
[18:40] <Trasp> Okay, I'm trying mix two audio files into one, not so they're played after eachother, but at the same time. What is the command I should look up? Stupid question maybe, but still..
[18:49] <Trasp> solved
[18:51] <Wzee> Same here! -vsync 0 skips the duplicated frames in the output from image2.
[19:15] <troulouliou_dev> hi why do i have an empty codec_name in AVCodecContext while codec_id is set and correct ?
[19:37] <JodaZ> wtf °.°
[19:59] <troulouliou_dev> http://bitbin.it/Ky30I5LP
[19:59] <troulouliou_dev> <troulouliou_dev> a small bug correction patch for the demux example
[21:49] <Mista_D> can't use "-ss 275 -i ..." for some reason, -ss 276 and -ss 274 work fine. Error is: "ffmpeg: libavformat/utils.c:1828: ff_gen_search: Assertion `pos_limit <= pos_max' failed." Core dumped... any work of advice?
[21:49] <Mista_D> word of advice (:
[21:52] <rjp421> which os and build version?
[23:20] <wodim> hello, i created a new .mkv file by copying the video stream of a file and the audio stream of another file. both files have the same length, but the audio starts desynchronising as the movie goes on. i suspect it's because the fps in both source movies are different. any hints?
[23:38] <lindenle> How do i link to libffmpeg.so in mac?
[23:39] <lindenle> or is it called dylib?
[23:42] <JEEB> FFmpeg contains no libffmpeg
[23:42] <lindenle> JEEB: oh so i just link to the differen libs lik libavcodec.dylib
[23:42] <lindenle> ?
[23:42] <JEEB> so go look at whomever provides that library and then go poke them :)
[23:43] <JEEB> did you even check what libraries you have? :P
[23:43] <lindenle> JEEB: yes
[23:43] <lindenle> JEEB: i was looking for libffmpeg... my bad
[23:43] <JEEB> well then you should know if you have libffmpeg or something else
[00:00] --- Sat Mar  8 2014